Abstract: A seatbelt retractor according to the present invention is configured in such a manner that a cylindrical rotor (24) of an electric motor in a spool is formed into two members in the axial direction, that is, a two-piece member including a first rotating member (24a1) and a first rotating shaft member (24b1), and a second rotating member (24a2) and a second rotating shaft member (24b2), and these two members are coupled. A torsional portion (42a) of a torsion bar (42) is penetrated through an inner hole (24b11) of a rotating shaft member (24b) including first and second rotating shaft members (24b1), (24b2) in the axial direction. Accordingly, even though the maximum outer diameters of first and second head portions (42b), (42c) of the torsion bar (42) are set to be larger than the inner diameter of the inner hole (24b11), the torsion bar (42) can be integrated into the rotor (24) easily.